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Figure 2 | BMC Infectious Diseases

Figure 2

From: Opportunities to improve storage and transportation of blood specimens for CD4 testing in a rural district in Zimbabwe using BD vacutainer CD4 stabilization tubes: a stability and diagnostic accuracy study

Figure 2

Comparison of CD4% measured on ST (index test), at different time intervals, and EDTA at day 0 (reference test). A: box-and-whisker plots showing the median and upper and lower quartiles. B: scatter plot displaying correlation. C: Bland-Altman plots showing the mean difference (solid line) and 95% lower limits of agreement (dotted lines).

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